Based on fotos, these relations of dimensions could be analysed.
One can see a inner ring (Innen-Ring) and a middle ring (Mittel-Ring),
then three ´half-moons´, here called inner-, middle- and outer-moon (Innen-, Mittel- and Außenmond).
However, these parts could be assembled also other kind.
An outer ring (Außen-Ring) encloses all.
An excentrity of 3 seems to be essential, also steps of 3 and 4 resp. 7.
It´s an open question, which parts will be fix together, which will be gear-wheels connected together, which parts will glide alongside which other parts, what shall be input- and what shall be output-parts.
Astonishing, for example, when all circles would be gear-wheels resp. gear-rims, a translation of nearby 2 to 1 would result.
Purly coincidence? There is no ´blind´ coincidence.
(Remark: some months later, that picture was interpreted quite other kind).
Evert / 20.11.1999